64155360557 has 2 divisors, whose sum is σ = 64155360558. Its totient is φ = 64155360556.

The previous prime is 64155360491. The next prime is 64155360571. The reversal of 64155360557 is 75506355146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47552780356 + 16602580201 = 218066^2 + 128851^2 .

It is a cyclic number.

It is not a de Polignac number, because 64155360557 - 2¹⁴ = 64155344173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64155360757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32077680278 + 32077680279.

It is an arithmetic number, because the mean of its divisors is an integer number (32077680279).

Almost surely, 2^64155360557 is an apocalyptic number.

It is an amenable number.

64155360557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64155360557 is an equidigital number, since it uses as much as digits as its factorization.

64155360557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890000, while the sum is 47.

The spelling of 64155360557 in words is "sixty-four billion, one hundred fifty-five million, three hundred sixty thousand, five hundred fifty-seven".